Hi ..
I have the following sort of xml (In an xmlType in the database ..)
<or_group>
<operand>a</operand>
<operand>
<and_group>
<operand>b</operand>
<not_group>
<operand>c</operand>
</not_group>
<and_group>
</operand>
</or_group>
This needs to be evaluated as
a+(b.(!c))
Here, a/b/c are linked to functions which return true/false values, with
the function taking some parameters.
It is possible to do this by creating a linked list out of the tree, and
evaluating in post fix using "native" planguages like C ..
Would like to know if it is possible in PL/SQL .. or is it wishful
thinking ?
Any replies .. even if to say that it isnt possible .. appreciated :)
Regards
Abhinav 2  1818 
"Abhinav" <ma************ @yahoo.dot.com> wrote in message
news:Q7******** ******@news.ora cle.com... Hi ..
I have the following sort of xml (In an xmlType in the database ..)
<or_group>
<operand>a</operand>
<operand>
<and_group>
<operand>b</operand>
<not_group>
<operand>c</operand>
</not_group>
<and_group>
</operand>
</or_group>
This needs to be evaluated as
a+(b.(!c))
Here, a/b/c are linked to functions which return true/false values, with
the function taking some parameters.
It is possible to do this by creating a linked list out of the tree, and
evaluating in post fix using "native" planguages like C ..
Would like to know if it is possible in PL/SQL .. or is it wishful
thinking ?
Any replies .. even if to say that it isnt possible .. appreciated :)
Regards
Abhinav
well, the PL in PL/SQL stands for Procedural Language. In fact PL/SQL
derives its syntax from ADA. So, if you know how to do it in C, you can do
it in PL/SQL, And yes, there is an XML parser callable from PL/SQL.
hth
rob van lopik
Robert A.M. van Lopik wrote: "Abhinav" <ma************ @yahoo.dot.com> wrote in message
news:Q7******** ******@news.ora cle.com...
Hi ..
I have the following sort of xml (In an xmlType in the database ..)
<or_group>
<operand>a</operand>
<operand>
<and_group>
<operand>b</operand>
<not_group>
<operand>c</operand>
</not_group>
<and_group>
</operand>
</or_group>
This needs to be evaluated as
a+(b.(!c))
Here, a/b/c are linked to functions which return true/false values, with
the function taking some parameters.
It is possible to do this by creating a linked list out of the tree, and
evaluating in post fix using "native" planguages like C ..
Would like to know if it is possible in PL/SQL .. or is it wishful
thinking ?
Any replies .. even if to say that it isnt possible .. appreciated :)
Regards
Abhinav
well, the PL in PL/SQL stands for Procedural Language. In fact PL/SQL
derives its syntax from ADA. So, if you know how to do it in C, you can do
it in PL/SQL, And yes, there is an XML parser callable from PL/SQL.
Thanks..
But are there structural constructs available in pl/sql to do the
transformation? data structures like B-Trees/Linked Lists ?
Given an arbitrarily complex expression of the above format, there
should be a result available in a scalable manner,,
the parsing is available in PL/sQL and I am aware of that ..
TIA
Abhinav hth
rob van lopik
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